Checking Charge Refrigerant Amount - wsm M7060 Workshop Manual

M6060, M7060, WSM

(4) Checking Charge Refrigerant Amount

After charging the refrigerant, check for amount of charging
refrigerant as follows.
NOTE
• The pressure on the following checking is the gauge
indications at ambient temperature 30 °C (86 °F), so it
should be noted that the pressure will differ some what
with the ambient temperature.
1. Disconnect the 1P connector of magnetic clutch.
2. Start the engine and set a approx. 1500 min
3. Connect the 1P connector of magnetic clutch to battery directly,
and then set the blower switch to HI position.
4. Leave the system for approx. 5 minutes until the refrigerant
cycle becomes stable, keeping pressure on the HI pressure side
from 1.3 to 1.6 MPa (13 to 17 kgf/cm
5. When the refrigerant cycle is stabilizer, turn off the blower
switch and let the compressor alone to run. Then pressure on
the LO pressure side gradually drops. At this time, if pressure
on the HI pressure side is kept from 1.3 to 1.6 MPa (13 to 17
2
kgf/cm , 190 to 240 psi), air bubbles which pass through the
sight glass (6) becomes as stated below depending on
refrigerant charged amount.
 Insufficient refrigerant charge
Air bubbles pass continuously the sight glass when pressure on
the LO pressure side is over 98 kPa (1.0 kgf/cm
case, charge the refrigerant from the LO pressure side.
 Properly refrigerant charge
Air bubbles pass through the sight glass continuously when
pressure on the LO pressure side is within 59 to 98 kPa (0.60 to
2
1.0 kgf/cm , 8.6 to 14 psi).
If the charge refrigerant amount is proper, no air bubble is
observed on the sight glass at pressure on the LO pressure side
2
over 98 kPa (1.0 kgf/cm
on. When the blower switch is turned off, bubbles pass through the
sight glass in case pressure on the LO pressure side is within 59 to
98 kPa (0.60 to 1.0 kgf/cm
 Excessive refrigerant charge
Air bubbles pass through the sight glass time to time or no air
bubble is observed when pressure on the LO pressure side is under
2
60 kPa (0.6 kgf/cm , 9 psi).
In this case, discharge excessive refrigerant gradually from the
LO pressure side.
(1) LO Pressure Gauge
(2) HI Pressure Gauge
(3) To Battery
9-S22
-1
2
, 190 to 240 psi).
2
, 14 psi) when the blower switch is turned
2
, 8.6 to 14 psi).
(4) HI Pressure Side Valve
(5) LO Pressure Side Valve
(6) Sight Glass
9Y1210828CAS0031US0
CABIN
(rpm).
, 14 psi). In this
KiSC issued 08, 2013 A